I understand what you write, but I don't understand how anyone can think that way.
First of, Umtiti commented on negative football from Barcelona some time back so him going to us at all is very unlikely.
Secondly:
Diego Godin is 32 & very loyal to Atletico Madrid, he'd be a short-term stop-gap at best.
Wanting to spend any money on him at all is silly.
Lucas Hernandez has played 63 games in 4 years, 19 this season. A unproven talent compared to Umtiti.
De Ligt is also very much unproven, the highest level he's played at is Ajax.
Skrinier while more proven than the two above is still someone who has proven less than Umtiti. 2 seasons in Serie A, 1 for 10th placed Sampdoria who let in 55 goals (8th on goals against in Serie A that year) and he just got to Inter. Give it a year or two and maybe he can be in discussion.
If(!) we can get Varane for 60 million or less (strongly doubt that with his contract
running til 2022 w/200m release clause vs 2021 w/60m release clause for Umtiti), then we still have to worry about his injury-history (
less of a issue this year). He'd still be a great buy and a good alternative to Umtiti if either was available, though considering we
reportedly tried recently it seems like he might not be that interested (or Real in selling).
Alderweireld is another who is a good option, but we won't know what Tottenham want for him, going by their history I doubt he'll be much cheaper than Umtiti's 60m euro release clause.
Alderweireld's £25m release clause supposedly doesn't come into effect until
summer 2019 (if Tottenham uses their right to extend his contract by one year).
By then we'll have a great but 30 year old Alderweireld vs a 25 year old Umtiti (or Varane who is born in the same year as Umtiti).
Honestly the biggest thing going against us signing Umtiti has nothing to do with his qualities or "value in the market", it's more to do with him likely not wanting to move from Barcelona but rather that he is looking for a improved contract.
If he does move there is also the comments about wanting to play attacking football which could turn him away from us. From the ones you've mentioned only Varane & Alderweireld are options that come with the qualities proven to be on the list compared to Umtiti.