Whether or not the new English mass was a “mistake” or not, that’s what we have today. That’s what we’ll , without a doubt , continue to have.
Most people who are in attendance like it the way it is. Those who don’t quit attending a long time ago, and even if Latin were brought back they wouldn’t know it anyhow. Either that or they’re dead by now, the Latin mass was discontinued over 30 years ago.
As far as the “indult” mass, for those who are devoted to it and don’t mind the travel to different churches and chapels, I guess its o.k., although I strongly suspect that the indult masses will become less available in the future.
Most dioceses will not be able to afford to take the priests away from parish work to provide this option, as the average age of priests is quite high and many will be retiring in the next few years with a relative few replacements.