Just 5 numbers are needed to send a text; aren't we going to run out of numbers soon?

my guess is they’ll just do the same as they did with our current day phone numbers—add another digit.

Aren’t those like “800” phone numbers, people buy ‘em for specific commercial purposes ?
(i.e. there would be a limited nunber f parties who would pay for that service.)
Also I think they are temporary/recycled.
In order to text a regular person don’t we always have to use their full phone number?

According to Wikipedia, “Short codes (also known as short numbers) are special telephone numbers, significantly shorter than full telephone numbers, that can be used to address SMS and MMS messages from certain service providers’ mobile phones or fixed phones.” You have to pay to get a short code, and relatively few people or organizations have them. After they give out the 100,000th of them, I don’t know what will happen, but I suspect there are relatively few in use, so maybe it’s not a worry.

So, as I understand it:

Since you can send text messages to full phone numbers, there’s not a great need for these 5-digit numbers. And since these 5-digit numbers cost extra money, most people probably won’t get them. They are primarily for businesses who want to provide their customers with a more convenient way to reach them.

If I’m off the mark, please let me know.