here is carlton trying hard but failing..
for one
0.5mBIT/s upload = 64kBYTE/s
64kBYTE/s = 3.75mBYTE per minute
3.75mBYTE/m = 37mBYTE per 10 minutes.

so not great if your trying to relay a block to more than 7 nodes in under 2 minutes.. but possible.
and knowing there are only 6000 nodes. and the rules of seven degrees of separation. you dont actually need to be connecting to 7 nodes,

infact if you live in a low internet upload rate. you are probably going to be one of the people that opts for the "pruned" and "no witness mode" anyway.

which brings me onto my other point.
segnet has seen many blocks that are also more than 1mb of real data.. so segwit does not solve the data rate, segwit is just as bloated as anything else

and by the way running pruned nowitness mode does not make you a full node. you are basically converted into being just an SPV wallet by enabling pruned/nowitness. so dont presume you can save bandwidth usage and remain a fullnode.

so expect that even with segwit the node population will drop.