OP, great analysis, if doge hash rate is 90GHs right now. at least 30GHs has to go away to look for a new home. look at volume in cryptsy, it will probably go to wdc, mega
I say expect the balancing act. So block size halves. Then multipools mine other coins. Then DOGE increases to compensate. So multipools switch back to DOGE. However, the sudden spike in difficulty of other coins slightly increases their price (I know the whole difficulty vs. price argument; I'm saying that in this case it's happening okay?). Multipools switch back to these other coins. And rinse and repeat for maybe 4-5 cycles.
This will probably be followed by a significant sell off. After that, who knows...
I doubt difficulty spike will lead to increase in price, the demand does not change, there is only so many bids in the market. multipool increased the number of newly minted coin available for sale. Everyday, so many coins are minted. Before, coins move to personal wallet. now, they sit in multipool account, and most of them will be transfer to an exchange wallet.