of course the future does matter when you decide to buy a new electronic device. There is rumour that winmo apps will not work on winpho 7. That's a decision-driver: someone needs backwards compatibility and he's gonna go for HD2 sb else wants to benefit from future things and he's going to wait for HD3
The OP stated his concerns clearly and asks for an opinion. Pretty valid

My opinion:
1. Uncertain future for the platform,
2. pretty much powerful even now, you can find pretty much all the needed things if you dig a little bit (and fiddle a little with the command line)
3. Awesome if you get excited by things like controlling the N900 with pc keyboard and mouse with synergy
4. MicroB itself (ok, backed up by the resolution) is enough to buy the device
5. Nokia generally does not release new OSes for devices but still supports them with fixes apps etc.
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