I'm not a Tellez believer (though, I suspect once all is said and done, the numbers between EE and Telez probably won't be that dissimilar in 2020), but I'm also not a believer in a bat only guy who's almost as old as I am. Basically, there's no upside to EE, you're going to get somewhere in the neighbourhood of 2 WAR at best from him AT BEST, and honestly I think there's a reasonable argument to be made that between guys like Fisher, Hernandez, Grichuk, McKinney, and Drury (and maybe Tellez), one or more of them is going to put up numbers better than that.
I really don't like the idea of a full-time DH on this team when there are so many question marks from guys who might contribute beyond 2020. At this point, I'd like to see Fisher, McKinney, and Drury jettisoned into the sun, but if I had my choice between one of them and the known commodity that is EE, I'd rather see any of them (and others, or other potential FAs) in the lineup.
I'm not totally writing off 2020, but I don't expect to see a playoff run, and I'd rather gauge what we may have in the future rather than getting all nostalgic for what we had in the past.