XBB is a variant of omicron and has already shown to be immune evasive

COVID19 variant P.1 (aka: Gamma) was also incredibly immune evasive. But Delta spread more than it, so Delta ended up being the dominant strain.

Immunity evasion is certainly a useful trick, but its not enough to become dominant. IMO, just wait around and see which variants show exponential growth. Currently, that's the BA.5 variant (but we're on the tail-end of this cycle).

BQ.1 is really the new variant of concern IMO, just reaching over the 10% mark in the past week or so, and continuing to grow seemingly exponentially.

FYI:

What We Know About All the New Covid Variants : https://nymag.com/intelligencer/article/what-to-know-new-cov...

CDC - SARS-CoV-2 Variant Classifications and Definitions : https://www.cdc.gov/coronavirus/2019-ncov/variants/variant-c...