Not sure it works this way for gold. If you have one super farmed carry and the rest of the team is fairly poor, the team total networth isn't going to be much bigger, so the bonus gold from that aspect is gonna be negligible and the rest of the gold is lower than currently. It's only relevant if the enemy team total worth is quite a bit higher than your team. In even matches or matches you're winning, your kills are worth less than currently, but in matches you're losing badly, the kills are worth a lot more, so basically a catch up mechanic.
For xp though, and specifically for a hero like meepo who gets xp so fucking fast, it's definitely problematic as killing Meepo will most likely feed a massive amount of xp since it's likely he'll get his xp without hurting his team's xp too much. In other cases it shouldn't matter too much.
Overall the change also punishes Midas stacking, if your entire team is higher lvl and higher gold but have 2k worth of a shit item like Midas, deaths are gonna be extremely brutal. Seems like a fairly solid system, other than the Meepo anomaly.
You also get more xp at 3+ heroes on a kill than before even with the xp factor being 0(team xp being the same or you leading), so I guess faster leveling, but you get less gold than before if the networth factor is 0 or close to it, especially if you solo kill someone say early in the game when teams have equal networth(old 125+12*lvl, new 40+7*lvl).
One thing I dislike is they're using Networth for gold calculations, which doesn't take into account buybacks. Your team's networth could be artificially lower than intended if you buyback a lot, giving you an advantage since the enemy doesn't get as much gold as they should if it was gold gained. Maybe they'll change networth calculations though.
Patch has a lot of cool changes, definitely want to see it in action. The chen change is pretty cool, finally being able to dominate ancients, though not sure any of them is worth it other than being a lot tankier than normal shit. Problem is you remove a lot of your team's ressources by dominating ancients that might end up being fed to the enemy carry if you lose a teamfight. I guess if you grab an enemy ancient it's nice though. Dragons might be good for base sieges too.