Nearly, the technological development that made line infantry tactics essentially obsolete was breach loading, because muzzle loading is rather hard to do in a prone position. Breach loaders already used pre-made ammunition cartridges in most cases, but magazines (especially non-internal ones) were a later development. Nonetheless they already made reloading much easier and also much faster than muzzle loading.

Rifled barrels giving increased range, gun powder that doesn't block vision by creating big clouds, and ammunition cartridges/needle guns played a role as well. But breach loading made the biggest difference to infantry tactics.

Advances in artillery range and accuracy also made line tactics much more dangerous after a certain point. However some more conservative commanders still used line infantry related tactics like bayonet charges until well after the advent of machine guns in the first world war.