The idea behind Neo900 is not death, actually it is better everyday.
Making 4G and CPU/Memory upgrade board for old phones to use Maemo Leste is upgraded idea

But why think only N900 to upgrade, maybe is it better design small enough "compute"-part and separate IO-part for different phones, so ports are right places..but because there is so less room for two PCB, have to make one PCB (and it is cheaper and more easy to fit). But not have to design from start for every phone.

And maybe it is better think old cool symbian devices like 7710/C6/N97/E6/E7 or old Maemo tablets 770/N800/N810, they have room and not have phone/4G-functionality at all already although they mic&speaker, so upgrade would be big change for them.

Also not forget old comminicators, touch screen is not so important, when you have keyboard/"mouse" like with 9300/9500 or E90.

Maybe there is some not Nokia devices good for upgrade for Maemo Leste?

What you think?