The reversed Page of Pentacles suggests that the current situation is not very conducive to making a large gain through an investment in emerging markets over the long term. This card speaks of missed opportunities and financial failures, and is associated with poor money management. The negative side of this card indicates that there are some obstacles to overcome before reaching the goal.
The Sun represents a period of success and financial well-being. This card is associated with the realization of one's goals, therefore it suggests that, if one faces the difficulties presented by the reversed Page of Pentacles, there is the possibility of obtaining a large return from a long-term investment in emerging markets.
Based on the above, the odds of a big return through an investment in emerging markets over the long term are average with a positive trend. The reversed Page of Pentacles indicates that there are obstacles to overcome before achieving the goal, but The Sun shows that there is also the possibility of achieving success if one deals with such difficulties correctly. So, in conclusion, the answer to the question is: yes, the chances of making a big return through an investment in emerging markets over the long term are good.