Well it depends on what shard you're on when it comes to Gold teams. We get a couple per week on Reunion. Though a TF might increase that somewhat. And add the option of an accolade.
20 levels of Blue is not analogous to 20 levels of Gold though, due to how Praetoria handles its story progression. If you include a TF anywhere before level 20 you can outlevel your contacts very quickly. So if there were to be a TF prior to the option to go to Primal Earth it should have level 20 as a minimum entry level requirement.
I'd like a TF in each of these zones. With the Night Ward one occurring in the later levels, since Gold side has a serious gap between 40 and 50.
Of course this is all beside the point since you can't revamp what doesn't exist.