It is actually very doable - 5k in one month.
There are still apps out there for 50-100k signup, some are legit targeted applications that are being resold, some are from some other shady sources.
2 Personal and 2 Business cards, 100k each = 400k MR points, @ the MR APY (average point yield) of 1.5 cpp = $6000, they keep 1k and you keep 5k.
Rumor has it that the spend comes from fully refundable tickets, a sure fire way to get your cards shut down.
But, you can do this all yourself, assuming you get a hold of some 100k applications you can do vanilla Reload and the other manufactured spend options.