Really? Could you see the next Tory leader dropping the Red lines or Revoking?
As I said, there are serious repercussions for both options, but a new Parliament might have a different sense of the situation than the current one.
The cold hard fact is that unless the next leader is for full on hard brexit then the only way out of the current impasse is compromise. If nothing else, May has proven that her red lines are ineffectual in securing a deal.
At the end of the day though, Brexit is one part ideological, two parts Tory power play. There's honestly no way of knowing how it will pan out because a Tory PM will come at this from a party angle, and not at what is good for the nation. As discussed, without a seismic shift in Parliament, an extension just kicks this whole mess down the road and we'll end up right back here in 9-12 months.