An individual thing IMO
Many people swap bikes too often for the suspension service to be an issue, and these serial bike buyers are also less likely to fit expensive aftermarket stuff as they will not be keeping the bike long.
For long term owners I think there are two camps, those like me that do not mind fiddling with settings and appreciate the difference high end suspension makes, and those who do not like to fiddle or are just content to ride the bike under them.
ES adds to the decisions as before ES we all started at the same point with the same options, whereas with ES you pay a premium and it seems wastefult o later throw the kit away / lose functionality and servicing options may be more limited, or more expensive - as will replacement if ever required.
I have also had great results from having OE units re-worked, often just a service using top quality suspension fluid can make quite a difference and some OE units can be fully rebuilt and re-valved, we recently had the Mrs TDM re-valved and serviced and for about 1/3 of the cost of a good quality shock it was transformed.
I expect once the bikes are out of warranty and suspension units start to fail the suspension experts will start to be given the shocks to look at, sooner or later we will find out what the options are, and as market demand increases the aftermarket market will respond, I know Wilbers already have ES shocks for the GS.
If buying new I would still go non ES, but that is because I know I would want to fit a better quality shock quite early on, but I think ES will better suit the majority of owners and probably be a more popular model in the used market.