As I said in that other thread, I think Gabbard and Steyer will be back for the debate after this one. And, however one feels about either of them being the actual nominee, this is probably a good thing for the process.
The election is a long way off, history tells us that when the field is big the set of front-runners doesn’t settle down until January or February, and I personally expect that the set of top 4 candidates by then will have at most 2 candidates in common with the current top 4.