Typically you don't hear anything about a firearm a few years after it has been released, it gets a lot of attention when it's new, then it slowly fades away, even if it remains successful and people in general like it.
Besides, single-stack .45s aren't all the rage right now, most folks are into high capacity subcompact 9mms like the SIG P365 or Springfield Armory Hellcat right now. So the Shield in general has lost some steam, and many anticipate that Smith & Wesson will make their own entry into that niche shortly.
That being said, the M&P45 Shield is a fantastic carry firearm which by all accounts is surprisingly soft-shooting for such a lightweight .45 ACP pistol. Furthermore, in the unfortunate event in which the AWB is reinstated like certain politicians are pushing for, then the M&P45 Shield will be exempt and therefore is likely to skyrocket in demand, so if you're thinking of getting one, then it's best to do so sooner rather than later.
I was actually looking to buy an M&P45 Shield as a new Summer Carry gun as well as an alternative primary EDC in the event that the AWB does make a comeback, but ended up getting an Performance Center M&P40 Shield instead because I happened upon a deal that was too good to pass up, and obviously I'm a fan of .40 S&W anyway.