I'm not quite sure how to answer this. I think kilts will be seen more often in more places, but I think we will see many styles.
The "tank" will always be with us as well it should be, but there are many who even now wear kilts that are "goth" or "casual" or whatever. They bear no resemblance to traditional kilts and in their context, that's ok. I think we as kilt wearers need to wear what we want, but realize that we have some responsibility to support other kilt wearers in what they want to wear.
For example....I wouldn't and shouldn't take anyone to task for wearing a goth type kilt. It's their choice. And someone shouldn't take me to task for wearing a semi-trad, or a kilt made of pseudo-tartan. It's my choice.
However...the goth kilt wearer shouldn't wear his kilt (punk style) to a office work setting because the negative reactions from that might keep a more kilt friendly policy from being put into place. Likewise, I wouldn't wear a pseudo tartan to a highland games scenario. That's the place for real tartan and I would wear my Stewart or MacGregor there. I wouldn't want to confuse the casual festival goer. That's the place for tradition.
In my opinion there are good reasons to wear all sorts of kilts depending on the context and the venue. Be wise....know the impression that you are likely to leave with others.
Be open to questions, and don't assume that just because you've heard the same question or comment 1000 times, that the question or comment wasn't sincere.
Kilts will always be in a minority, that's just the world we live in, but they will be a bit more common in my opinion, and that's a good thing.