ROhan is a vulnerability which allows some ROP magic which is needed to actually execute arbitary code (e.g. homebrew) on the switch. But without a proper ROP chain it is nothing but hot air.
The reason to stay below 3.0.1 (or == 3.0.0 for ROhan) is to get homebrew after all...since nobody can say for sure that there will be other exploits >3.0.0 (despite that i am sure that this will happen somewhere in the future)
and yes at least the next 6 month are only exciting if you want to dev for the switch (personal opinion)
All the nitty gritty stuff needs to be developed before we can use it