To put the Franchise label on any of these three is to equate them with Kobe, Pierce, Lebron, Duncan, Shaq, KG and company.
I don't think that's fair. We aren't calling them First-Ballot Hall of Famers. We are just saying they have the potential to be the best players on a contending team.
In that case, I think it is yes for all 3, but to varying degrees. People give Kevin Love a lot more crap than he deserves simply because he's been stuck on these terrible Minnesota teams. If he were on a half decent team people would appreciate him a lot more. He is a really special player. I know there are questions about his defense (also, even if his one-on-one defense isn't good, the ability to box out and grab defensive rebounds IS an important defensive quality, and he is the best player in the league at that), but I don't think people really understand how dominant he is offensively. The numbers he puts up are phenomenal. Just look at his per 36 numbers: 59.1% True Shooting; taking 18.3 shots per 36, 6.5 3PA per 36, and 8 FTA per 36, with 1.41 PPS.
For comparison, the average PF in the league has 53.9% True Shooting; taking 12.6 shots per 36, 1.6 3PA per 36, and 3.8 FTA per 36, with 1.22 PPS. Kevin Love has a really one-of-a-kind combination of volume and efficiency that you really do not see (even Kobe and other championship level players aren't that efficient at that volume).
I think Love is a no-brainer, and people will see that once he is on a decent squad.
Rondo and Melo I put on the same level. They are both supremely skilled players that could easily be the best player on a championship team, but are flawed enough that they can't necessarily elevate ANY team to that level. They need a team/system more designed around them to succeed, whereas someone like Kevin Love I think can work on any team of competent players.