Your opinions and thoughts are probably what most of us think as well, Mythre. But in some thought and hindsight on my own part, I'm beginning to suspect that GAINAX and the original writer, Bunjuro Nakayama, had already thought of these results. True, it feels like that the series deserves another few seasons...but I wouldn't be too surprised if they had deliberately refrained from adding more to it for two particular reasons:
1. It doesn't appear that Nakayama had intended for the storyline to proceed any further. True, he could use some loose ends as Dr Memory has and create more plot, adjusting things as he goes, but usually it doensn't work out so well for series if the original writer had not deliberately left loose ends in preparation for a sequel, let alone had some idea of more plotlines in advance.
2. Overmarketing, or else known as "milking" -- somewhat similar to the above idea, but the previous point emphasizes that the quality of the story may fall due to little plotline opportunity. This one simply means that they're completely overdoing it. If they had continued the series, and created some absolute junk for a "new" ending, that would lower the overall quality of the series.
Those two points aside, though, judging by the quality of the series, I'd suspect that any attempts by them to extend the series would be done very carefully, so that they prevent that. I remember there being a link to a petition to GAINAX to extend Mahoromatic somewhere in this section of the forum. It may be worth a try to look around there, and redirect those petitioners to that link you gave.
If anything, a newer ending would higher the quality of the story (sense why does a romantic/comedie have that much sadness in it)?
It's possible the development team for this project might feel like how we feel about the ending in a sense, and that the story should be continued, but they are only human and must have had tons of other works to do along with this project.
Think of Gundam and Dragonball/Z/GT, that of course was overmarketing but it continued. All I am thinking about those animes is that either the low parental rating reached a lot more fans and/or the Project developers had lots of time on their hands along with resourses.
Although animes like gundam and dragonball were funny and action packed and has a few romantic values, it's somewhat unlike Mahoromatic is.
What I think Mahoromatic is, in a sense, an anime that teaches you values in life.
As I said before, I am 15 years old but I understand things very differently from normal kids in retrospects.
As a reason, my brain has a different nerve impulse set up like normal kids.
I go
Cat->Tree->House->Dog->Animal while normal kids go
Cat->Dog->AnimalI have to say tho, I can speak perfectly in my head, but I can't speak what I am thinking without over thinking and blurting out words that make no sense to everyone else, except myself and a very experienced psychiatrist.
Ok, to continue the subject :cough: I believe adding in a season 3, 4, and maybe 5 to the Mahoromatic story wont hurt the story, but just make the story friendlier, happier, and funnier with your ecchi added to enlighten and smoothen the story line. I don't really know what the feeling is but when ever I watch the show, even now, it just has that certain feeling that makes worry float away. Just a fuzzy feeling I get that makes me wish I could just float away to an uncaring world.
This is just me. But I think I grew up faster then most kids my age. Even my friends think I sound like their parents, which is kinda scary. But given the things I've experienced when I think about it... their is nothing I could have done but grow up and leave a big part of my childhood behind.
... I'll just go and petition the link to that post you were talking about... I've rambled too much (and yet so little) of my feelings to this forum...

Yeah...
P.S. Those nude scenes that you call... um... Ecchi, well they seemed perfectly normal to me for some reason that I don't understand. For some reason I have memories of feelings like those Scenes in Mahoromatic of being with someone I am fond with, but I know that I have Never Ever been in such a situation... maybe in this life anyway... but thats a contradictory reason in itself.