All efforts that tend to diminish the domination of bitcoins so far has been proved futile. The more they try to supress btc the more giant it grows.
Please check the charts. The dominance has decreased by more than 4% during the last 7-8 days from 71.5% to 67.2%. I am not sure whether this spike will continue in the near future, but this is the biggest jump in altcoin market share so far this year. And it happened very quickly as well. For me, it looks like a temporary spike and I expect the dominance to go back to 70% plus within the next few weeks.