[breischl]

>at one point just the cost of the frame for keeping the cell integrity (specially under wind loads etc.) would start dominating costs

Pretty sure I've seen that the cells themselves are already a minority of the total cost of a solar installation. Most of it is labor, permitting, framing (as you mentioned) and other ancillary things. Dropping the price of PV cells is all to the good, but it's not the limiting factor for mass adoption of PV.

Increasing the efficiency of cells would help more, since you could get more power from a given amount of the other supporting stuff.