I suspect that the major trouble won’t be for the internet; but for the hapless people trying to use it in Thailand.
Even when true, the whole “The internet treats censorship as damage and routes around it” line kind of involves ‘routing around’ the area with the censorship. Unless Thailand has an atypically strong grip on the world fiber network and a desire to piss off major backbone operators; I’m sure those of us outside the country will be able to carry on without incident.
Inside, not so much.
(edit: the one area where internal censorship policies do tend to spread dangerously, even if architecturally they should be route-around-able, is if the country doing the censoring is seen as a particularly attractive market. Lookin’ at you, China; and the various pusillanimous western tech companies who have lined up eagerly to play ball in the hopes of getting a slice of that sweet, sweet, customer base. With countries of limited economic interest, just letting them rot in their isolated dystopia may be a moral issue; but technologically the rest of the internet can just shrug and carry on with its day. When access to a given market is valuable enough that companies can be…induced to cooperate…in exchange for continued access; you have a much larger problem.)
