Don't you think it would be a good time to reset the whole testnet (or just start a new one on a side), so that anyone can play with it as much as they want.
i was thinking the same when i found out about the current reward, but you have to realize that testnet difficulty drops to minimum quite often and miners can potential burst mine lots of blocks to get a lot of reward in total.
additionally there currently are at least half a dozen working testnet faucets that pay from 100k to 1 mil satoshi per claims that are ranging from 15 min to 12 hours. these amounts are more than enough for majority of tests that developers want to perform.
for anything that requires any higher amounts (which are extremely rare cases) they can always run their own testnet using a self contained network (eg. testnet in a box) and run their tests.