This is largely bullshit. It's hard because the people with 30 years made it hard for new people. Congress can change their own rules and make it easier. They already have legislative aids and lawyers that handle the minutiae of writing the laws.
It's also far more likely that the corporate lobbyist is influencing the senator they've known for 30 years more than the one that showed up yesterday. States have term limits and it doesn't make them slaves to lobbyists.