can we get a futa trans character for the straight route to be romanceable in the future
No, please NO.
If that is the content you want, there are plenty of games that have it. Go and buy/support/play those titles.
A large majority do not want to see futa/trans/gay content at all. Please do not ask for it in titles that appeal to the mainstream. Most of us will lose interest in any title that adds this type of content.
I am not saying that your interests are not valid... I am saying go and find your kinks in titles that already support them.
If I were to go into the comments of futa/trans/gay titles and ask them to add more straight content I would be ridiculed, down-voted, and ignored. What makes you think that doing the reverse would give you a better outcome?
https://en.wikipedia.org/wiki/LGBTQ_demographics_of_the_United_States
The above is a link to a wiki about the percent of the US that identifies as LGBTQ+ with sources. I admit, as a poll it is not exact, but it does estimate that less than 10% of the population are LGBTQ+ and less than 2% are trans.
I have not disparaged your opinions and preferences. I stated that instead of adding them here, you should go and find a game that already caters to you.
I would mention that yuri/lesbian is not gay/trans/futa. while in the past lesbians are considered gay, in modern times that is not always the case... Generally, gay is consider as male/male and lesbian is female/female. If in modern times lesbians are all considered gay, why does the modern acronym LGBTQ+ need an "L" at the beginning?
You are right... this is my opinion, I am not the dev. I never said otherwise, However, I suggested than mainstream content would lose interest in the game. The numbers above will bear that out. 90% of the people do not care to see futa/trans characters; and that is what the OP asked for, not yuri/lesbian. While 10% of the people might want that content it will not come close to replacing the 90% who would lose interest.
And before you try to argue, no, straight people do not like gay content. They are likely to overlook a bunch of that in a hollywood movie or TV show; but they definitely will not want to see sex scenes with gay content, and a futa dick being used on a man would be considered gay by straight people even if you do not see it that way.
For the record, yuri/lesbian content is accepted by most straight men, but admittedly not all. The ones that accept it are either just happy about seeing naked women, or fantasize about being with multiple women at the same time and consider it a prelude in their mind. (and that is why harem games are popular.)