I would not see them as an alternative to bitcoin, and neither would most of the people I work with, as these approaches backdoor the dependability which bitcoin achieves through decentralization.
Stablecoin is not beertoken. It tries to achieve stability within a decentralized system.
Maybe it can't work, but it has no single point of failure.
In the future, you may want to read the OP carefully in order to avoid disqualifying yourself like you did in this case. To quote the OP on stablecoin: "From then on, we keep track of how much USD has inflated/deflated using something like CPI or the Billion Price Index or even a combination of indices". Have a look at the wording: The idea is to introduce a single point of failure, either through CPI or Billion Price Index. "Or even" multiple points of failure through a combination of indices. But a stable, decentralized system is completely out of the question. Basically, stability is completely sacrificed, but ironically it is put into the name...