Speaking identical language in future would never provide benefits. This is simply because, without having knowledge of other language, there would be less opportunities in job sections. when individual will only speak familiar language, for instance, there would be numerous companies which would conduct seminars in overseas side in order to expand their business. Even they perhaps select those who are able to speak more than three different languages. Due to that, they might never get the chance to feel new culture and atmosphere which make them miserable. Consequently, not knowing such language in near future may be give profound bad effect.
In addition, speaking one language which have been familiar with for a long time and not willing to aquire another one restrict people from travelling the world. In other words, if anyone wants to travel country, then they will undoubtedly encounter several unknown humans and it may be impossible for them to obtain appropriate information to reach somewhere. For example, when my brother was 8 years old, he moved to Spain but one day he lost before coming to home as he would not speak Spanish language and because of that he could not ask for help. Therefor, people are afraid to talk with someone which probably make them less confident. However, speaking same language in future will be beneficial for kids as they will come across to know the history of their country.
To sum up, form the point mentioned above, despite that fact that there is no offence for keep going with one language, i strongly believe that not learning more than one language in future will not give judicious job as well as travel experience. 
Speaking identical  
language
 in  
future
 would never provide benefits. This is  
simply
  because
, without having knowledge of other  
language
, there would be  
less
 opportunities in job sections.  
when
 individual will  
only
 speak familiar  
language
,  
for instance
, there would be numerous  
companies
 which would conduct seminars in overseas side in order to expand their business. Even they perhaps select those who are able to speak more than three  
different
  languages
. Due to that, they might never  
get
 the chance to feel new culture and atmosphere which  
make
 them miserable.  
Consequently
, not knowing such  
language
 in near  
future
 may be give profound  
bad
 effect. 
In addition
, speaking one  
language
 which have been familiar with for a long time and not willing to  
aquire
 another one restrict  
people
 from travelling the world.  
In other words
, if anyone wants to travel country, then they will  
undoubtedly
 encounter several unknown humans and it may be impossible for them to obtain appropriate information to reach somewhere.  
For example
, when my brother was 8 years  
old
, he  
moved
 to Spain  
but
 one day he lost  
before
 coming to home as he would not speak Spanish  
language
 and  
because
 of that he could not  
ask for
  help
. Therefor,  
people
 are afraid to talk with someone which  
probably
  make
 them less confident.  
However
, speaking same  
language
 in  
future
 will be beneficial for kids as they will  
come
 across to know the history of their country.
To sum up, form the point mentioned above, despite that fact that there is no  
offence
 for  
keep
 going with one  
language
,  
i
  strongly
 believe that not learning more than one  
language
 in  
future
 will not give judicious job  
as well
 as travel experience.