While releasing the card as an easily-acquired promo would make the card easily accessible to players, you must remember there are still a lot of people who value the collectibility of a card only obtainable by playing in the World Championships. Reprinting this card would take away some of its uniqueness, and might annoy collectors.
Now... why is that a major concern?
1) I don't know of anyone that wants an exact reproduction of either of the previous promos... thus from a collector's standpoint the supply won't change. What may change is that the value, currently inflated due to demand from the competitive side of the game, will diminish as a less "collectible" version will become available. Even that is uncertain because the initial supply of
Tropical Beach (either version) is small enough that collector demand may still outstrip supply enough that those in possession of the card can just "sit" on them and wait for a buyer willing to shell out (their own finances permitting).
2) When it comes to making the Pokémon TCG successful, it is important to remember the three major component's of its customer base:
- Players of the game
- Collectors of the cards
- People buying it because its Pokémon (neither player nor collector)
The third group appears to be the biggest... but they are also the least discerning and easiest to please and so while technically a constraint, seldom will it actually be binding because other factors will prevent you from breaching the boundary e.g. keep it Pokémon and they keep buying.
The first and second groups... I don't know who is bigger. I know there is a significant amount of overlap as well. The important thing to remember is market penetration; the game can get alone without either of these groups, but the goal is to get as many as possible. So... can you make the game collectible without damaging the players? Indeed; many players are thrilled that because they pull a hard-to-find version of a card they can sell/trade it to collectors... because the player can use the mundane, easier to find version that has significantly less monetary (and collectible) value.
TL;DR: This is an artificial situation brought about by the foolish practice of creating "unique" cards for exclusive Worlds Promos; eventually such a card was bound to be good enough to impact competitive play significantly, let alone affect it at all. While releasing a third version of
Tropical Beach that is clearly not either of the previous printings may not be solution, the only reason there is a problem is due to questionable policy and failure to weight the situation properly. A new printing of
Tropical Beach will not impact anything but the most casual of "collectors" that settle for any version of a card; any remotely serious collector will still desire the elusive "Worlds" versions because the supply of those promos will not be changing.