ntop Play the waiting game AND get the cheapest Gen 9 phone you can find.
If GOS can effect full support of Gen 10 phones, then that's ideal, and your Gen 9 becomes a backup.
if GOS comes up with its own phone, then get it, and your Gen 9 becomes a backup.
If we're destined for a long waiting game, at least you're covered by your cheap p9
If it comes to pass, supporting a new GOS hardware phone would be good for GOS, good for the phone mfgr, good for you, and a good, hard lesson for Google.