If everyone is on the same rest schedule, the DM can make the rest 10 minutes long, an hour long, 8 hours long, even a week-of-relaxation long.
The resting mechanic becomes ... better ... when there is only one kind of rest.
Personally as DM, the single rest will be strictly when narratively appropriate.
It does seem like 5e is phasing out the short rest − and I approve − but how the Warlock will work remains unclear to me. Will both the Wizard and now the Warlock still have an Arcane Recovery feature to regain spell slots − perhaps now as a 10-minute ritual or something?