FFXI had a lot of great ideas that can be used as inspiration for a lot of things. When people suggest ideas to come from XI I don't think the devs will read that and just rip the ideas right out of XI and put it in XIV. I think the feedback people give in regards to XI ideas making their way into XIV is more for inspiration. For example, I loved campaign and dynamis in XI and would love something similar in XIV, but I would be disappointed if they just copied them in. I'd like to see a dynamis but improved (something for people that enjoy large scale PvE) and campaign but improved (a soloable, rewarding, epic, and large scale pve battle).

So I would agree and would hope the devs don't try and copy any ideas directly in. But using XI as an inspiration for ideas can't hurt.