As there is no 'team' behind bitcoin, how is it going to develop and make sure it is always competing with newer coins?
There is no official team because no one owns or control Bitcoin. But there are groups (like the Core team that maintains the Bitcoin Core software) that "work on Bitcoin" and suggest/implement new features on it.
For example, SegWit was implemented on Bitcoin 2 years ago, suggested by some Core devs:
https://github.com/bitcoin/bips/blob/master/bip-0141.mediawikiIs there a possiblity the new coins could be linked with bitcoin or that future bitcoin 'integrates with them and their technology which therfore increases their prices?
What exactly do you mean with "linked"? I would say it's unlikely, while possible in a technical way.
I think he means if Bitcoin can intergrate technology like mimblewimble, as Litecoin will probably do in the future.
If there is consensus tech will be intergrated, there are a few limitations though.