It would of course, at a large scale. If bitcoin would never scale, some other coins might take the spot who already has the lead in terms of adoption and development e.g. LTC or ETH. However, what coin would replace bitcoin that I have no clue about since I'm still wary about ETH rise and LTC seemed to be too far off the charts.
Exactly. I mean,
it's not that difficult to create a coin that would surpass Bitcoin in market cap and adoption. All its needs it's to implement SegWit at launch, establish a very limited supply with no premine or ICO, and have active development to be able to surpass Bitcoin. By having a deflationary model and everything else just like Bitcoin, it would quickly gain traction. Especially by having SegWit within the first day of launch, which will be a huge booster for the new coin
If it is not difficult, what are you waiting for?
The problem is that just implementing SegWit in a brand new coin won't help you a lot, if at all. Simply because SegWit aims at solving the problem of scalability which is already there. But to run into that problem in the first place, you should already have wide adoption, otherwise SegWit will be of no help to you altogether. Further, SegWit itself is no more than an interim solution which somewhat fixes current issues (which a brand new coin wouldn't have anyway), but it doesn't allow infinite scalability in the way Lightning Network does. So more power to you implementing the latter from scratch if you think it is as easy