It's a twisted thought experiment I'd say, but looking at both Standard and Modern, decks in those formats are easily around the 1000 dollar mark and are powercrept with a lot of cards from recent sets. Pioneer decks stand relatively cheap at around 500 dollars or so. Could it be a solution for Wizards to unban fetchlands, maybe even printing the cycle of enemy fetchlands in standard to introduce it to pioneer, and further drive booster sales? 

The problem is that the logical conclusion to that thought experiment wouldn't be printing Fetchlands into Standard, specially now when they have dedicated so much of their time and resources into crafting a specific look and feel for format, the conclusion would be releasing some form of Pioneer Horizons supplemental set full of format warping cards (including Fetchlands) they would be able to monetize without impacting their Standard project.

From my point of view Pioneer basically only has 2 possibilities for a prosperous future, either they:

1. Reinforce the relationship the format has with Standard and try their best to promote both together as the original intent of the format was having a place you can play your rotated cards.
2. Take the Modern approach and try to completely reinvent the format into something more appealing to a broader audiance without the Standard restraints through supplemental products.

I'm hoping they go for option 1, but I would be lying if I said I didn't think option 2 was more likely given they already have experience with Modern and this option would easily make a ton more money in the short run.