What if I don't care whether the app is there or not and I just want any youtube link to go to the m.youtube.com rather than opening the actual youtube app?
I think that was OP's original question and I'd like to know also if this is possible... Just like browser changer but for youtube.
Whenever I clink a YouTube link it goes to their site and not my app. Always been like that for me. I don't use safari though but I can't imagine that being the reason.
What you need is poof from Cydia. That will hide it, and then you can unhide it whenever you want. No respring either, which makes it really convenient! And even while it's poofed, you can still use the app via spotlight.
Too easy...go into setting, general tab, turn on restrictions and select YouTube. This will remove the icon and when you go to m.youtube.com in safari it uses the mobile website not the app.