In case anyone is curious, I did the calculation; over 8,000 RGB tapret tx can be contained in a single Bitcoin block, and each tx can transfer over 64,000 tokens, for a total of half a billion, or a theoretical Bitcoin on-chain token TPS of over 14k.
Discussion
445 WU for a 1 in-1 out P2TR TX with TapRet commitment, of 4M WU per every 10 mins... Technically a max upper bound of 2^16 (65535) of transfers on a single output. This kind of scale would necessitate some form of custodial platform token aggregation, likely on a multisig, and with MuSig2 that shouldn't increase tx size.