I’d love for him to stay in Houston for the reasons you mention, but I’m not sure I agree with your assessment.
It’s a chicken & the egg thing. Rodgers locks onto Adams because MVS & other options aren’t consistent or reliable. Fuller would give the Packers a legit WR2, something they seem to have been searching for for a couple seasons.
I don’t see his floor as “bust” in GB any more than it’s been in HOU, like last week where he did virtually nothing outside of that late game TD.
I also don’t see GB making efforts to acquire Fuller if they don’t intent on using him. That would be a little bit silly, IMO.
A move of Fuller to GB would probably have the most impact on Adams workload, to the dismay of Adams owners.
Dynasty-wise I’m more concerned long-term than 2020, as Watson is a relatively young, dynamic QB and I don’t know what the future holds post-Rodgers.