I am not sure to understand the logic here.

Nokia has (should have!) probably emphasize the possibility for you in a not-so-long future that the work on Maemo could be used for Harmattan and then pure Meego (the Qt story). I am not a developper but seems that the additional work is limited. And Harmattan is not announced but is due for (unfortunately this is not clear yet) the first quarter of 2011.

So now you have almost finished a product for Maemo. You can start selling it (ok with a limited market) but still can have some money from us and continue receiving bugs and comments from the 'great' community.
But instead you prefer to hold on?

Just for the fun and clearly not having all information you have, this is my logic
1/ You start to sell the application for N900 users (it seems to be almost ready). You get some money from the work you have already done!
1bis/ In the same time, you look at being compliant with Harmattan/Meego.

2/ When Harmattan (the Nokia product which should have mass market) is released, you have something ready and you enter directly the market with success guaranteed because you are first and because you had time to fix the possible bugs

2bis/ you could look at symbian: again seems to me that the work is not huge and you increase (at least) visibility of your brand with the 3.5 millions per day downloads of Ovi

Sorry for a useless post. But the fact that you are stopping Maemo is a drama for people following the thread/the development for some time now...
(sorry for the poor english)

Edit: just thinking that the reason is maybe that Harmattan is delayed till second semester of 2011 ??!!