well, if one starts with a SUPERIOR product they can wait, until competition starts to catch up. Apparently that is what Sony has been able to do - rumor has it, that they delayed the A6000 update twice already during 2015 ... "for lack of competition". But now it seems to be coming. Sony Alpharumors quotes "availability in markets in March 2016".
Canon however started their mirrorless system with the EOS M, a product INFERIOR to competition and priced higher than most competitive products. We know the outcome: fire sale. After that Canon brought annual updates M2, M3 - each time still shy of the goal by quite a bit. Still inferior in many key aspects. Sensor/IQ, AF speed and tracking capability, lack of (built-in) viewfinder, or Powershot user interface instead of an EOS one. To date, Canon has not offered one truly competitive M body ... yet.
Canon did offer what i consider a very smart and attractive range of EF-M lenses however. Small, light, inexpensive and optically anywhere from "good to excellent". Only 4 lenses needed to cover 11mm to 200mm. Only a compact, moderately fast short/portrait tele lens is missing. Any longer focal lengths or big aperture or otherwise specialized lenses would be so big, that one can as well use available EF/EF-S lenses via adapter.
Fuji X-lenses on the other hand are as retro-styled fashion items and more importantly: almost as big, heavy and expensive as Canon FF lenses. Just look at that new Fuji 100-400/4.5-5.6 godzilla lens: despite covering APS-C image circle only it manages to be LONGER than the Canon EF 100-400 II, not much lighter and nearly as expensive! Totally ridiculous.
Sony lenses are either expensive and optically not very good, or come with a Zeiss label, making them optically a bit better but extremely expensive. Actually, if it were not for that haphazard lens Sony E-mount offering, I would have gotten myself an A6000 already.
Samsung failed in pricing, marketing and as a company - not necessarily at the product level.
The rest is "no-go zone" a.k.a "m43 land", populated by a huge mess of lenses from all sorts of makers and either video folks (Panasonic) or a few stills shooters far and between, who are willing to pay high prices for quarter-format sensors and lenses (Olympus).