Intelsat 33e breaks up in geostationary orbit

It is particularly bad for a satellite in geostationary orbit to break up or fail. Satellites are packed as tightly as possible into that orbit due to its economic importance (it's very useful for a satellite, particularly communications satellites, to always be over the same part of the Earth), so there is a higher than normal likelihood that this could be seriously disruptive.

Not to mention debris can be in GEO for a long, long time. People worry about LEO constellations causing Kessler syndrome, but the reality is that LEO debris deorbits in the order of months/years. GEO is much, much longer.

no

if it remains in GEO orbit (same speed vector), it will remain in same "place" relative to other satellites, and won't ever hit them

if it changes speed vector, it's no longer in GEO orbit