Possibly in the minority, but it's a fair argument. My counter would be we have 2.2 million sitting there, and I think it's at least somewhat possible that you could have both. If the Warriors want to move him on, then he's going to be limited on options if his price is too high.
I'm generally fairly against putting Ponga at 5/8th this early in his career, too. He's not fully physically developed yet, and as much as he coped with the workload in Origin - it probably contributed to busting him up for the rest of the year. I think there's a real possibility he goes all the way on his line break if he wasn't gassed from all the extra defence, too. I think Kalyn can play anywhere in the backline and be effective, but it's about where he can be most effective - and I think for the next few years that's definitely fullback. It's also where he wants to play himself... and I feel like we risk losing him long term putting him at 5/8th right now. I just don't see it as a smart decision, yet.
Lastly, it's hard to argue that Johnson wouldn't significantly improve our team... even with his inconsistency. He is a freak talent... and I like having as many of those in my team as possible. Given the cash we have free, I don't see why having a serious look at him should preclude us from also getting some quality middles. Kalyn Ponga and Shaun Johnson playing off each other in the same team is an absolute nightmare for any opposition team. I think SJ would thrive in an environment where he didn't have to steer the ship and could play as an opportunist.
In fact, the more I think about it and the more I type - the more I love the idea. It could be a real boon for us on the market if we could get a name like SJ over the line. What prop wouldn't want to play in front of that spine?