If you talk about other alts based on pos or some other algorithm then it work as more centralized base system to the rich and superior ones and if you wish to invest in them then nobody's gonna stop you but don't ask for Bitcoin like security.Did this energy consumption has increased suddenly after the Musk comments and some government statement? The miners need to put more effort to mine block with increasing difficulty and providing security to the network.Many mining pools are finding alternative ways to mine Bitcoin using renewable sources because electric consumption also reduces their profitability.They are reluctant to find some alternates for this.But one thing is for sure Bitcoin is not going to be dead inspite of many FUD in the market like in the past.