First, congrats to Manny Pacquiao, truly one the best of all time, all-time-greats.
Second, he said that he will fight next year, he already had two fights this year, so I doubt that he will seek another fight in less than six months.
Third, legacy wise, it is not good for him to fight a past prime Amir Khan, doesn't look at his last fight, he should at least face him like 4-5 years ago, the hype around Amir is not there anymore as well.
The best option for Manny right now, is Errol Spence Jr/Terrence Crawford. If Manny wins either against this two he will cemented legacy and might cemented his status even greater than Floyd Mayweather, IMHO.
I’ve heard Errol Spence Jr./Terence Crawford to be the exact next that Manny Pacquaio will fight... just some humor & a slight chance to be the next. Actually I don’t know quite yet who are these 2 growing professional boxers. But looking at their record are very impressive and Errol Spence Jr is a southpaw type of boxer also... could he be the next manny pacquiao?