While I hope that you're right, the counter-argument to a release in June is that redesigns for Macs and iPads have conventionally taken longer than a year. For example, while the 2015 MacBook Pros (the last of their design generation) were released in March and May respectively, the 2016 MBPs were announced in October of 2016, almost 1.5 years later. Similarly, the 2017 iPad Pros were released in June 2017 (roughly a year after the previous generation), but the 2018 iPad Pros took until October of 2018. There are exceptions, but redesigns generally take Apple a little longer than more marginal upgrades.
Now the 2018 MBPs were released in July, but towards the end of it. With the WWDC starting at the 3rd of June this year, this would mean that a potential redesigned MBP would come just 10 months after the previous generation, even less than one full year. It would be an unusually short timespan for a redesign. Maybe you're right in that Apple wants to get this update (with a fixed keyboard) out as soon as possible, but then again, redesigns take time and the butterfly keyboard has been around since March of 2015, so I doubt a few months more would concern Apple that much. And up until now, MBP redesigns have happened every four years, so a redesign in fall 2019 will already break habit and be earlier than expected.
I would be totally onboard for you being right and a release happening at WWDC, but realistically, unless we get some rumors pointing to a WWDC release in the next couple of weeks, I would rather expect a release in fall, maybe at an October event, all things considered.