Are you unable to see the advantages of an ETR or is it having assessed it judge it isn't worth it?
The advantages seem purely theoretical and you have yet to establish the need for an ETR.
Millions of hours flown with the conventional tail rotor in all aspects of the helicopters versatile roles and the number of TR failures and malfunctions is very small.
One crash with an as yet undetermined cause but some form of TR issue and you are proposing ETR as the saviour to that scenario and ignoring the realities of system failure/loss of power in the ETR, not to mention that many of the solutions, such as jelly's, ignore the amount of time many helicopters spend in the hover as opposed to the high speed cruise.
Keep on with your blue-sky thinking but I will be surprised if we see ETR in the next 10 years at least.