the main problem with the BETI as I mentioned earlier in this thread is it needs to account for the dilutional effect of all other crypto's
A rough real BETI would be BETI x BTC market dominance.
Yes, that has an effect, but does not change the overall form of the graph , unless BTC loses its dominance entirely (ie below 30%, say).
A loss of dominance for BTC is only likely to happen if another crypto were to take its place in the adoption order.