Hive's core features still work all the same and never changed since the first block, 8 years ago.
Likewise, BEEM's core functions (inherited from Piston) also never changed for those 8 years.
If you stay away from the higher level, abstract classes of BEEM, or at least use them consciously, you can probably use it forever.
OK,... I was under the impression some BEEM functions might stop working due to HIVE tinkering.., good to know.