I don’t know. I don’t see how it can be a bigger problem than the original chassidim becoming chassidish in the first place.
I never thought it was such a problem for someone to establish their own minhagim when they start their own home as long as it’s according to halacha. But I don’t know, maybe it is, and everyone should ask their own sheilah.
My impression is that a lot of people nowadays don’t keep up the minhagim of their ancestors, but maybe I’m wrong, or maybe they’re wrong.