If the decision is made to hold a public inquiry, as you would like, some lessons will be learned from that. Mr. Johnston can continue his work. He's a smart man, a lawyer and law professor, and his recommendations are certainly quite useful. However, issues such as the intelligence to evidence gap are not new. There was a discussion on this during development of draft legislation under the Harper government in 2015 and during development and drafting of legislation under the Trudeau government in 2017.
The only thing missing is the political will to make decisions. A bill needs to be drafted, and parliamentarians need to take the time to hear from witnesses and study, improve, amend and, ultimately, pass that bill.