I never said it will definitely be july/june. It's my educated guess, nothing more. Just warned them if they want to hope it will be delayed over your hope to beat the 4/6 year rule, do it at your own risk. You can hope but also be realistic at same time. After all you have been told it's approx 1 year to be fully implemented. Be prepared that it may not turn out the way you hope it would.
As for leaving Canada, again, which is more important. Qualifying for citizenship or relax, have fun or having to leave for personal reasons. If you want to stay in Canada in the hopes that the cutoff is in Aug/Sept to barely meet 3/4 rule, I'm not stopping you. That's your own business. If cutoff does get delayed til sept, lucky for you. You took a gamble and being proactive. If the cutoff came earlier than you wanted, oh well, at least you tried. If you felt you did it all for nothing, don't blame anyone but yourself. You brought that all on yourself. It's called being accountable for your own decision.
If I was in the situation that I qualify in Aug/Sept then I can hope it can get delay until Sept but won't bank everything on it as if my life's depended on it.
There is more to life than obsessing over a cutoff date that hasn't been announced yet. If you think qualifying for citizenship under 3/4 rule is more important than your enjoyment in life, you need to re-examine your priorities.