I'll just point out that, while San Diego's never been a powerhouse at any point in their entire history, there are two things working in their favor right now, one of which is always in their favor and another which is more contemporary:
1) it's San Diego. I mean, c'mon.
2) Their farm system is stacked. Is it going to blossom this quickly in 2019? I wouldn't put my money on it, but I'll just point out that the Yankees weren't expected to break out in 2017, and the Braves weren't expected to break out in 2018. Breakouts sometimes happen unexpectedly.
The Padres must have the money to spend, so good on them for actually spending it. The reticence MLB teams have developed towards spending any money at all has been one of the more frustrating developments in the sport these past couple of years. San Diego, on its own, is one of the most attractive markets in the entire country to play in. It shouldn't be so difficult to entice players to go there.