And CW contests are filled with F-key pushing computer operators.
Indeed they are. To win a CW contest, you will need at least some degree of those. Which is why it would be more interesting if there was also a category for CW without any memory keys, or even just mechanical keys. But I think there are some such contests.
No skills required.
As explained and accepted in later comments below, there are certainly skills required. Especially listening skills.
Why contests then??
Some people love the competitive nature, or the group cooperation as a team, or pushing themselves and their equipment to the limit. It's not my idea at least at this age, to stay awake for most of 48 hours using a computer to log, macros to push, but, if the contest is short, or of a different type that shows up skills I am good at myself e.g. copying messages accurately, then I'm interested. There ARE lots of different types of contests, and contesting is no doubt a good thing for amateur radio, and different types of contests.
That said, many of the major contests in general appear to need a lot of improvement, such as having a genuine CW category that rules out any Digital CW, use of decoders (e.g. this will become a problem in future: an ENTIRE contest of multiple TX can run the entire contest from finding frequency, search and pounce, calling, logging, everything, WITHOUT any operator while the "operator" i.e. USER simply is off fishing, having coffee, watching the tell-lie-vision. Perhaps at that point they will finally acknowledge a "DCW" category.
Another problem, is that contesters really should be considerate to OTHER users of the bands on a weekend. It is not enough to simply say "well you have the WARC bands". There should be at least respect to give the QRP frequencies a berth, and indeed, contest free segments, e.g. above 14059 and below 14010 should be contest free, taking 20m as an example. So that those wanting to work DX can do so down the bottom 10kHz and those wanting to have QSO, QRP or QRS can use the top 10kHz. WHY NOT. CW is also allowed in the SSB section, so during a major CW contest there could be a PART of the shared SSB section also used for the CW contest.
I have a lot more respect for contests even in their current often-inconsiderate form for non-contesters than "DX unspecified and thus unlimited split" because those DX Pedos also sometimes wreck the WARC bands on a contest weekend, and unlike contesters do not occupy a bandwidth of 50 Hz per station, on a CLEAR frequency (no contester will sit on a used frequency as the QRM wills slow them down) -- and CW contesters acknowledge the fact and make use of it that CW is less than 50Hz wide, so they are happy to make full use of the spectrum instead of all being a rediculous 1000 Hz apart.
DX Pedos on the other hand occupy upwards of 30 kHz PER DX Pedo do not listen on their own frequency, AND the DX Pedo demands a full 1000 Hz exclusion zone around their signal -- at least, the DX Pedo Philes chasing the Pedo do, many of which are using decoders and remote internet mobile apps and remote stations with big time lag -- something no contester would do or they'd simply fail.
Interesting discussion and thanks to OZ8AGB for getting it rolling.]
As to original topic, FT8 I don't see how it will be a contest killer, just as it will not be a CW killer. It has its uses and is not for everyone or all the time. Like any other mode. Some advantages, and many disadvantages.