Hm is it a thing with red and blue together specifically? I had a good period there were I was buying only red plaids and blue plaids. Once I noticed I made myself branch out and I don't regret it. Off the top of my head I've now got a red/white, blue/blue, black/white, and black/emerald plus a blue gingham, yellow gingham, and oversized white/gray gingham (we're talking tops only, don't get me started on pants!). Nice mix, the red/white plaid gets the most wear by FAR (I think it's the best quality one, that could be part of it). I think you could do your country punk with other plaid mixes, if you were looking to add new plaids.
And all that said, that looks like a fabulous breezy summer plaid shirt. Worth replacing an older shirt with a more traditional fit with this one that has a more current fit? (Aside, dang the green version is just gorgeous!)
I don't mind replacing some things after a season; cheaper sweaters, active-casual tees/tanks... Usually knit things and the occasional experiment that I didn't end up enjoying (I don't consider these mistakes -- if I don't play sometimes I don't know for sure if I'll like a trend!). I wear sweaters sooooo much from Sept-May that I just get tired of them! But I usually hang onto my sweaters for a few seasons before replacing.