I think it's gotten somewhat easier to use, but mainly the prices have come down so much that it's much more realistic for someone to justify and purchase. Especially with memory cards being as cheap as they are today.
In the days of gameboy and gameboy color flash carts, you were stuck with one cart with fixed storage and you had this obnoxious parallel port adapter to hookup to your computer (which had to be plugged into your computer on bootup and usually had to make bios changes to get the adapter recognized). It was still as easy as loading a game onto the flash cart after that, but if you were an early adopter you were screwed because later games that came out were much bigger sizes than the carts cold hold, so you'd typically have to upgrade again, or just wait. Not to mention the program to flash roms would only recognize the device about half the time.
Nowadays with USB hookups and easy to use programs, it's a joke getting a game onto the memory card. Games are also much easier to find with widespread torrents (broadband doesn't really have an effect on handheld piracy I would wager), and memory cards hold significantly more storage that there's never a worry about the card being too small for a game (you were lucky to get 4 gbc games on one flash cart).
With that being said though, I don't really think in terms of piracy it's much more widespread than what it was before. Most people have no idea what it is, and outside of my family I have never met anyone that has heard of flash carts (or memory card options) and uses it on their DS. I think that with the new technology it just makes it easier for those who would pirate anyway.
The only thing that's getting harder these days is finding reliable sites to purchase from. Almost everyone that was in piracy back then knew about Lik-Sang and the ease of getting products. Now it's actually much tougher to make sure you'll actually get your product reliably from a site.