Well, Canon did it. They actually released a full-frame mirrorless lens designed for entry level users with a cost comparable to its DSLR counterpoint. Yes, that’s right, we’re talking about the Canon RF 50mm f/1.8 STM. Coming in at a measly $199, this is quite possibly the cheapest full-frame mirrorless lens on the market for any system that actually comes from a camera manufacturer.
The lack of inexpensive lenses to attract newer or lower budget users into the full-frame mirrorless market (especially when there are full-frame cameras under $1K) has been one of the biggest complaints about all the new systems that have come out over the last couple of years. Panasonic just started to address that a little more with their new 85mm f/1.8 for L mount and now Canon seems to be doing so as well.