I'm not saying I like the option, but it might be better than these two options...
1) Losing Betts after 2020 and getting only a comp pick. (The ickiest choice, unless we win a 2020 ring.)
2) Trading Betts and not re-signing him after 2020.
3) Not trading Betts, missing the playoffs in 2020, then re-signing him.
4) Not trading Betts, missing the playoffs in 2020, then not re-signing him.