If you remove lobbying from a political system then the elected officials exist in a vacuum with no information coming from outside sources. Remember charities and NGO's also lobby government (as well as the churches, mosques, temples, big pharma, little pharma, oil, mothers for this or that, fathers for other stuff, governments for war, governments for peace.... this list is endless).

The problem isn't lobbying. It's corrupt elected officials who at best accept bribes/payment to fund an overly expensive electioneering machine. The problem is that lobbying happens with no public over site and now accountability.

The problem is more complex than just removing lobbying. Do you really want government making decisions without asking companies advice? The same companies that the government expects to implement strategies?

Say for example the USA predicts a 20% increase in crude oil use over the next 10 years. Where the refineries should go, where the oil is best sourced, how the petrol products are best distributed are all important questions that the oil industry is well placed to help answer. Not dictate of course but their opinion should matter.

EDIT: Before anyone accuses me of supporting the current system please give me the benefit of the doubt. I understand the system is inadequate as it stands but to remove lobbying just creates another problem of equal gravity.