I empathise, having moved to Ubuntu Touch mostly due to the browser woes. (And yes, browser aside, UT does not come close to the n900 in terms of functionality.)

I doubt there ever will be a large incentive for developers to update Maemo Fremantle, as the neo900 - the only possible future hardware platform - in my view simply does not offer enough of a step- up from the n900 to make it widely attractive. That's if the neo900 appears at all. And then a dev has to take on the task of updating or replacing microb. Big ask, IMO.