Ive got a 2DS here and honestly I strangely didnt have any problems except once a failure message saying that the cartridge was pulled out.
I bought mine like November I guess (2014 ofc) and it had firmware 8.1 if I remember correctly. I surely updated to 9.0 and now its on 9.2.
There is logic in that too. If they wait for Nintendo to release all their devices they would be able to test if Nintendo changed anything from firmware/hardware side, so they can be sure that gw will work on ALL N3DS. That way they would surely avoid a bit shitstorm like their bricking shitstorm (although only 10 or so devices were affected).
So thats actually why they would hold it back. It all comes down to finance vs reputation. They brick some of the n3ds, users will RAGE. They dont, well they lose money on the way there. Its the balance to keep and I think they just decided to be better safe than sorry.
Also assuming, that the new patch on the 13th will patch up Sky3DS for sure, and GW would be able to adapt to the new firmware (which is surely great IF), then the money goes all back to GW again. I m just trying to use their logic here.
Just my two cents