I attended an FAA conference in Wichita and had an opportunity to speak with a Cessna engineer. I asked him if there was any chance that the 152 would come back into production? His answer was what I suspected and what mort of you might already know.
Cessna will never bring the 152 back because:
1. It would cost Cessna nearly as much to produce the 152 as it does the 172, and would have to charge close to the current 172 price to just break even. The 172 lost money the first few years of production and barely makes a profit now.
2. The 152's useful load is not suitable anymore for today's heavier pilots. Even with the IO-240 with FADEC, the design just cannot heft much more weight then it now can.
3. The 152 cannot compete with the other two place machines out there (Katana, Liberty, etc) or the new sport category aircraft.
So, take good care of the 150's and 152's now flying; there won't be any more.