Shouldn't the baseline for a ranger be self sufficiency? If we think of fantasy Rangers, Aragorn or whatever, they're generally self sufficient. In the real worl Army Rangers are meant to operate far beyond the leading edge of direct support. Texas Rangers are supposed to operate largely alone without support.
Why not start from that point?
That point has been started with...asked, answered...handled six ways from Sunday. The ONLY bloody thing everyone agrees with here is the Ranger has to be self-sufficient/good at survival in the Wilderness.
In 5e, this means, gets/is good at Wisdom[Survival]. Maybe some bonus to Wisdom[Survival] rolls...and/or can be assumed to be better at it as, with Wisdom as their casting mechanc, most rangers will have a pumped Wis. score. Done and dusted.
Need to hunt? Survival roll.
Forage for berries? Survival roll.
Find clean water? Survival roll.
Built or find a shelter? Survival roll.
Identify poisonous mushrooms? Could be Survival. Could be a Nature roll. But in this context, a Survival roll would certainly work for most DMs, I would think.
Build a "simple" snare/pit [given the time] trap? Probably could be covered in Survival roll.
Need to replace arrows, create a spear or stake as an emergency weapon? I'd say that's fairly well Survival roll too.
Need to follow a trail, find your way back to town, hunt down a deer, in a word, TRACK!? Welcome to 5e. Just need a Survival roll.
[EDIT to add a few more I thought of]
Notice a storm is approaching without a cloud in the sky? Survival roll. [or Nature, I'd say]
Notice, by the size and depth of the scars on a tree, that you just stumbled into an owlbear's territory. Survival [or Nature] roll
Notice when their are animals/birds are moving/migrating in ways they shouldn't be or when the whole wilderness goes silent [for whatever/some unknown reason]. Survival [or Nature] roll.
Know which direction you are traveling and keeping mental track of where you've been/how to get back...general "not getting lost"? Survival roll.
[/EDIT]
Food, water, shelter. In what other way of being self-sufficient would you say D&D Rangers, in a fantasy world, need to be self-sufficient?
The simplified skill system is great in a lot of ways. And I LOVE it over "every nook'n'cranny/there's a skill for that!" style! But in the case of Survival, a looooot of flavor and utility has kinda all been, just, wiped out/under the umbrella. Previous editions could list out most of the above things as separate things the ranger could do. In 5e, just roll your Survival and move on. It really washes out/makes bland a lot of the wilderness-specialist flavor.
Even without a rewrite, for anyone paying attention/wanting that outdoorsy guy...or, for ANY ranger [or any other character, for that matter] taking the Outlander background gets you Survival proficiency "for free."
SO, yeah. Your "self-sufficiency as the base of the ranger" is kinda...already known/acknowledged/done.