My suggestion: if you have an immediate need for a good everyday laptop that runs Mac OS and handles routine stuff (mail, web, MS Office/iWork, Photos, iMovie, etc.), then go for it. My 2019 MBA has been great. The 2019 keyboard seems to be more reliable than the processors, and you get a 4 year warranty. I like the feel of the keyboard, but some folks don't, so check it out.
On the other hand, if you have an older model MBA that is running just fine, then I would wait and see what Apple does with the next MBA update to both keyboard and internals (eg processor, storage, SSD, etc..). No rush to buy, so why do it? I had a 2014 MBA that was a wonderful machine. My only issue was that it was a little skimpy on RAM. Also, I got a good deal on the new MBA and got a nice credit for my old machine. Nevertheless, it was not an essential purchase or upgrade.....just something I wanted to do.
I tend to replace my laptops every 5-6 years. So, $900 MBA purchase - $200 credit old MBA = $700/5yrs = $140/yr, less than $12 per month. Or, less than 40 cents per day for something I use a couple of hours per day. Not bad. I'll just absorb the risk that the keyboard could crap out in the last year of use without warranty coverage, which I think is unlikely. Really, not that big of a deal.